package 字符串.反转字符串_344;
/*
    编写一个函数，其作用是将输入的字符串反转过来。输入字符串以字符数组 s 的形式给出。
    不要给另外的数组分配额外的空间，你必须原地修改输入数组、使用 O(1) 的额外空间解决这一问题。

示例 1：
输入：s = ["h","e","l","l","o"]
输出：["o","l","l","e","h"]

示例 2：
输入：s = ["H","a","n","n","a","h"]
输出：["h","a","n","n","a","H"]

提示：
1 <= s.length <= 105
s[i] 都是 ASCII 码表中的可打印字符

思路：
        双指针即可，从前往后遍历，互相交换值就行
* */
public class Solution {
    public static void main(String[] args) {
        char[] s = {'h', 'e', 'l', 'l', 'o'};
        reverseString(s);
        for (char t: s) {
            System.out.println(t);
        }

    }

    public static void reverseString(char[] s) {
        int l = 0, r = s.length - 1;
        if (s.length == 1){
            return;
        }
        while (l < r){
            char temp = s[l];
            s[l] = s[r];
            s[r] = temp;
            l ++;
            r --;
        }
    }
}
